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20808700 = 22521118917
BaseRepresentation
bin100111101100…
…0001111111100
31110011012011121
41033120033330
520311334300
62022000324
7341604523
oct117301774
943135147
1020808700
1110822980
126b760a4
134407553
142a994ba
151c6081a
hex13d83fc

20808700 has 36 divisors (see below), whose sum is σ = 49262472. Its totient is φ = 7566400.

The previous prime is 20808691. The next prime is 20808703. The reversal of 20808700 is 780802.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8359 + ... + 10558.

It is an arithmetic number, because the mean of its divisors is an integer number (1368402).

Almost surely, 220808700 is an apocalyptic number.

20808700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20808700 is an abundant number, since it is smaller than the sum of its proper divisors (28453772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20808700 is a wasteful number, since it uses less digits than its factorization.

20808700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18942 (or 18935 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20808700 is about 4561.6554012770. The cubic root of 20808700 is about 275.0521113366.

The spelling of 20808700 in words is "twenty million, eight hundred eight thousand, seven hundred".

Divisors: 1 2 4 5 10 11 20 22 25 44 50 55 100 110 220 275 550 1100 18917 37834 75668 94585 189170 208087 378340 416174 472925 832348 945850 1040435 1891700 2080870 4161740 5202175 10404350 20808700